20010999997 has 2 divisors, whose sum is σ = 20010999998. Its totient is φ = 20010999996.

The previous prime is 20010999977. The next prime is 20011000001. The reversal of 20010999997 is 79999901002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13677068601 + 6333931396 = 116949^2 + 79586^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010999997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010999977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005499998 + 10005499999.

It is an arithmetic number, because the mean of its divisors is an integer number (10005499999).

Almost surely, 2^20010999997 is an apocalyptic number.

It is an amenable number.

20010999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010999997 is an equidigital number, since it uses as much as digits as its factorization.

20010999997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 826686, while the sum is 55.

The spelling of 20010999997 in words is "twenty billion, ten million, nine hundred ninety-nine thousand, nine hundred ninety-seven".